Weapons Procurement, Navy (WPN) — procurement of strategic and tactical missiles, satellites, torpedoes, guns, and other weapons; ammunition and other ordnance; spare parts; and support equipment

Other Procurement, Navy (OPN) — procurement of ship and aviation support equipment, communication and electronic equipment, ordnance support equipment, civil engineer support equipment, supply and personnel/command support equipment, and spare and repair parts

Research, Development, Test and Evaluation (RDT&E) — research, development, and evaluation in the areas of basic research and technology development, advanced technology development, strategic and tactical programs, intelligence and communication programs, and overhead and support costs of the Navy's RDT&E effort

Procurement, Marine Corps (PMC) — expenses necessary for procurement and manufacture of ammunition, weapons and tracked combat vehicles, guided missiles and equipment, communication and electronics, support vehicles, engineer and other equipment, and spare and repair parts

The following Navy appropriations include functional areas for which the Marine Corps programs and budgets its own share. The complete TOA for the Marine Corps includes both the Marine-unique appropriations above, as well resources from the following appropriations:

Military Construction, Navy (MCN) — acquisition, construction and installation of permanent public works, naval installations, and facilities for the Navy and the Marine Corps

Military Construction, Navy Reserve (MCNR) — construction, acquisition, expansion, rehabilitation, and conversion of facilities for the training and administration of the reserve components of the Navy and Marine Corps